As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LOWER LIGHTS WERE FOUND INOPERATIVE AT 21B AND 20CDE. MAINTENANCE FOUND THAT THE BATTERY PACK AT STA 804 HAD FAILED. THE BATTERY PACK WAS REPLACED PER B717 AMM 33-51-18. OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT HAS RETURNED TO SERVICE. (LP #5547384)